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Pat. 10855199 United States, Int. Cl.22 H02M 7/483, H02J 3/18, H02M 1/32. Voltage balancing in a Modular Multilevel Converter having delta configuration : Appl. N 15/781006 : Filed 18.12.2015 : Pub. 01.12.2020 : / Beat Buchmann, Jerome Fischer ; Assignee Abb Power Grids Switzerland Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10855199/en?oq=US10855199.html (дата обращения: ДД.ММ.ГГГГ).